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arXiv · 2108.05247

AGN feeding and feedback in Fornax A: kinematical analysis of the multi-phase ISM

F. M. Maccagni·P. Serra·M. Gaspari·D. Kleiner·K. Morokuma-Matsui·T. A. Oosterloo·M. Onodera·P. Kamphuis·F. Loi·K. Thorat·M. Ramatsoku·O. Smirnov·S. V. White
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Abstract

We present a multi-wavelength study of the gaseous medium surrounding the nearby active galactic nucleus (AGN) Fornax A. Using MeerKAT, ALMA and MUSE observations we reveal a complex distribution of the atomic (HI), molecular (CO), and ionised gas in its centre and along the radio jets. By studying the multi-scale kinematics of the multi-phase gas, we reveal the presence of concurrent AGN feeding and feedback phenomena. Several clouds and an extended 3 kpc filament -- perpendicular to the radio jets and the inner disk ($r\lesssim 4.5$ kpc) -- show highly-turbulent kinematics, which likely induces nonlinear condensation and subsequent Chaotic Cold Accretion (CCA) onto the AGN. In the wake of the radio jets and in an external ($r\gtrsim 4.5$ kpc) ring, we identify an entrained massive ($\sim$ $10^7$ M$_\odot$) multi-phase outflow ($v_{\rm OUT}\sim 2000$ km s$^{-1}$). The rapid flickering of the nuclear activity of Fornax A ($\sim$ 3 Myr) and the gas experiencing turbulent condensation raining onto the AGN provide quantitative evidence that a recurrent, tight feeding and feedback cycle may be self-regulating the activity of Fornax A, in agreement with CCA simulations. To date, this is one of the most in-depth probes of such a mechanism, paving the way to apply these precise diagnostics to a larger sample of nearby AGN hosts and their multi-phase ISM.

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F. M. Maccagni, P. Serra, M. Gaspari, D. Kleiner, K. Morokuma-Matsui, T. A. Oosterloo, M. Onodera, P. Kamphuis, F. Loi, K. Thorat, M. Ramatsoku, O. Smirnov, S. V. White. 2021-08-11. AGN feeding and feedback in Fornax A: kinematical analysis of the multi-phase ISM. https://doi.org/10.1051/0004-6361%2F202141143

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